All I can say is that the work presents very nicely IMO, and the only other Sussex I can remember seeing was of Canadian origin - don't know if that was the specific market, just that the original owner had bought it and lived his entire life in Canada. It was 32/33mm IIRC - only glanced at it; hadn't gotten into vintage much yet.
Though it's a somewhat smaller group, someone over at the Vintage Rolex Forum may know these well.
Curious, did they clean the dial as well?
Great heirloom piece!
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